content/docs/r3.3.1/api/org/apache/hadoop/io/GenericWritable.html - hadoop-site - Git at Google

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 <h2 title="Class GenericWritable" class="title">Class GenericWritable</h2>
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 <li>org.apache.hadoop.io.GenericWritable</li>
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 <pre>@InterfaceAudience.Public
  @InterfaceStability.Stable
 public abstract class <span class="typeNameLabel">GenericWritable</span>
 extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
 implements <a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>, <a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></pre>
 <div class="block">A wrapper for Writable instances.
  <p>
  When two sequence files, which have same Key type but different Value
  types, are mapped out to reduce, multiple Value types is not allowed.
  In this case, this class can help you wrap instances with different types.
  </p>

  <p>
  Compared with <code>ObjectWritable</code>, this class is much more effective,
  because <code>ObjectWritable</code> will append the class declaration as a String
  into the output file in every Key-Value pair.
  </p>

  <p>
  Generic Writable implements <a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf"><code>Configurable</code></a> interface, so that it will be
  configured by the framework. The configuration is passed to the wrapped objects
  implementing <a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf"><code>Configurable</code></a> interface <i>before deserialization</i>.
  </p>

  how to use it: <br>
  1. Write your own class, such as GenericObject, which extends GenericWritable.<br>
  2. Implements the abstract method <code>getTypes()</code>, defines
     the classes which will be wrapped in GenericObject in application.
     Attention: this classes defined in <code>getTypes()</code> method, must
     implement <code>Writable</code> interface.
  <br><br>

  The code looks like this:
  <blockquote><pre>
  public class GenericObject extends GenericWritable {

    private static Class[] CLASSES = {
                ClassType1.class,
                ClassType2.class,
                ClassType3.class,
                };

    protected Class[] getTypes() {
        return CLASSES;
    }

  }
  </pre></blockquote></div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>Nov 8, 2006</dd>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/GenericWritable.html#GenericWritable--">GenericWritable</a></span>()</code>&nbsp;</td>
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 <td class="colFirst"><code><a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/GenericWritable.html#get--">get</a></span>()</code>
 <div class="block">Return the wrapped instance.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code><a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/GenericWritable.html#getConf--">getConf</a></span>()</code>
 <div class="block">Return the configuration used by this object.</div>
 </td>
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 <tr id="i2" class="altColor">
 <td class="colFirst"><code>protected abstract <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>&gt;[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/GenericWritable.html#getTypes--">getTypes</a></span>()</code>
 <div class="block">Return all classes that may be wrapped.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/GenericWritable.html#readFields-java.io.DataInput-">readFields</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)</code>
 <div class="block">Deserialize the fields of this object from <code>in</code>.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/GenericWritable.html#set-org.apache.hadoop.io.Writable-">set</a></span>(<a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>&nbsp;obj)</code>
 <div class="block">Set the instance that is wrapped.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/GenericWritable.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</code>
 <div class="block">Set the configuration to be used by this object.</div>
 </td>
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 <tr id="i6" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/GenericWritable.html#toString--">toString</a></span>()</code>&nbsp;</td>
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 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/GenericWritable.html#write-java.io.DataOutput-">write</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)</code>
 <div class="block">Serialize the fields of this object to <code>out</code>.</div>
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 <h4>GenericWritable</h4>
 <pre>public&nbsp;GenericWritable()</pre>
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 <h4>set</h4>
 <pre>public&nbsp;void&nbsp;set(<a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>&nbsp;obj)</pre>
 <div class="block">Set the instance that is wrapped.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>obj</code> - </dd>
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 </li>
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 <a name="get--">
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 <h4>get</h4>
 <pre>public&nbsp;<a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>&nbsp;get()</pre>
 <div class="block">Return the wrapped instance.</div>
 </li>
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 <a name="toString--">
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 <h4>toString</h4>
 <pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toString()</pre>
 <dl>
 <dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
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 <h4>readFields</h4>
 <pre>public&nbsp;void&nbsp;readFields(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)
                 throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/hadoop/io/Writable.html#readFields-java.io.DataInput-">Writable</a></code></span></div>
 <div class="block">Deserialize the fields of this object from <code>in</code>.

  <p>For efficiency, implementations should attempt to re-use storage in the
  existing object where possible.</p></div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../org/apache/hadoop/io/Writable.html#readFields-java.io.DataInput-">readFields</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>in</code> - <code>DataInput</code> to deseriablize this object from.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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 <h4>write</h4>
 <pre>public&nbsp;void&nbsp;write(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)
            throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/hadoop/io/Writable.html#write-java.io.DataOutput-">Writable</a></code></span></div>
 <div class="block">Serialize the fields of this object to <code>out</code>.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../org/apache/hadoop/io/Writable.html#write-java.io.DataOutput-">write</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>out</code> - <code>DataOuput</code> to serialize this object into.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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 <h4>getTypes</h4>
 <pre>protected abstract&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>&gt;[]&nbsp;getTypes()</pre>
 <div class="block">Return all classes that may be wrapped.  Subclasses should implement this
  to return a constant array of classes.</div>
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 <a name="getConf--">
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 <h4>getConf</h4>
 <pre>public&nbsp;<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;getConf()</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">Configurable</a></code></span></div>
 <div class="block">Return the configuration used by this object.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">getConf</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Configuration</dd>
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 <!--   -->
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 <h4>setConf</h4>
 <pre>public&nbsp;void&nbsp;setConf(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">Configurable</a></code></span></div>
 <div class="block">Set the configuration to be used by this object.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>conf</code> - configuration to be used</dd>
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